Which of the following statements is true?

I. When a company is involved in more than one activity in the entire value chain, it is integrated.

II$.$ A vertically integrated company is less dependent on its suppliers than a company that integrated.

III. By pooling demand for parts from a number of companies, a supplier may be able to scale that result in lower cost than if every company makes its own parts.

A$)$ Only statement III is true.

B$)$ All of the statements are true.

C$)$ None of the statements are true.

D$)$ Only statement I is true.